diff --git a/code/ryzom/tools/client/ryzom_installer/src/configfile.cpp b/code/ryzom/tools/client/ryzom_installer/src/configfile.cpp
index 663eff3ea..1181dd613 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/configfile.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/configfile.cpp
@@ -455,6 +455,11 @@ QString CConfigFile::getMenuDirectory() const
 
 bool CConfigFile::has64bitsOS()
 {
+#ifdef Q_OS_WIN32
+	// 64 bits only supported under Vista and up
+	if (QSysInfo::windowsVersion() < QSysInfo::WV_VISTA) return false;
+#endif
+
 	return QSysInfo::currentCpuArchitecture() == "x86_64";
 }
 
diff --git a/code/ryzom/tools/client/ryzom_installer/src/installdialog.cpp b/code/ryzom/tools/client/ryzom_installer/src/installdialog.cpp
index ff5bfc6c7..baf9516f0 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/installdialog.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/installdialog.cpp
@@ -54,7 +54,6 @@ CInstallDialog::CInstallDialog():QDialog()
 	updateDestinationText();
 
 	// check whether OS architecture is 32 or 64 bits
-	// TODO: 64 bits client only supported under Vista+
 	if (CConfigFile::has64bitsOS())
 	{
 		clientArchGroupBox->setVisible(true);
diff --git a/code/ryzom/tools/client/ryzom_installer/src/migratedialog.cpp b/code/ryzom/tools/client/ryzom_installer/src/migratedialog.cpp
index 50fa92412..b2941744c 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/migratedialog.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/migratedialog.cpp
@@ -51,7 +51,6 @@ CMigrateDialog::CMigrateDialog():QDialog()
 	updateDestinationText();
 
 	// check whether OS architecture is 32 or 64 bits
-	// TODO: 64 bits client only supported under Vista+
 	if (CConfigFile::has64bitsOS())
 	{
 		clientArchGroupBox->setVisible(true);